Apparatus for handling strip material



June 11, 1935. A. POTDEVIN 2,004,129

APPARATUS FOR HANDLING STRIP MATERIAL Filed Jan. 8, 1932 IN V EN TOR.

M We" ATTORNEYS.

Patented June 11, 1935 UNITED STATES APPARATUS FOR HANDLING STRIPMATERIAL Adolph Potdevin, Garden Qity, N. Y., assignor to PotdevinMachine Company, Brooklyn, N. Y., a corporation of New York ApplicationJanuary 8, 1982, Serial No. 585.519

8 Claims. (01. 271-2.2)

lar material.

One of the objects of my invention is the provision of a constructionwhereby the usual slack is produced in the material prior to thecutting-01f operation, means being provided, however, whereby tension ismaintained in the material between the point of cut-off and the feedrollers thereby preventing wrinkling or creasing of the material. Thisis particularly advantageous when handling cellophane or similarmaterial inasmuch as creases or wrinkles therein cause the material tocrack and shatter unfitting the material for use.

lnthedrawing: Fi l is a sectional elevational view of an em- 1 :nent ofmy invention;

Fi 2 is a view with the parts in difierent position; and

Fig. 3 is a plan view.

Referring to the drawing in detail, land 2 desite, respectively, theupper and lower feed rollers of a bag making machine, these rollersadvancing the material 3 to a pair of pinch rolls t and 5 and fromthence to advancing rollers t and 1.

Intermediate the feed rollers and pinch rolls I provide cutting-oilmechanism comprising the plates 8 and 9 and striker bar It. Theconstruction sofar mentioned is well known.

When handling cellophane or similar material I prefer to heat the plate9 slightly by the application of a heater ll thereto which may be anelectric hot plate.

The pinch rolls 4 and 5 travel at a lower peripheral speed than the feedrollers l and 2 and hence when the active portion l2 of the pinch roll 4moves to operative position the advance of the material 3 is retarded toproduce a slack in the material which is desired for the cutting-01foperation.

The present invention has for one of its objects means whereby thlsslackwill be confined to the space between the striker bar III and the pinchrolls 4 and 5 so that at no time will there be slack material betweenthe striker bar It and the feed rollers I and 2. This is of advantagewith any material but is particularly advantageous when working withcellophane as creases or wrinkles in cellophane cause the same to crackand shatter and unfit it for use.

In this connection I provide a rod J3 intermediate the striker bar Itand the pinchrolls. This rod is fixed and the material 3 as it passes tothe pinch rolls passes over the top of this bar or rod and is supportedthereby.

At the rear of the pinch rolls I provide a shaft It adapted to be rockedin the frame of the machine, this shaft carrying apair of arms l5 whichare curved beneath the lower pinch roll 5 and carry a flat plate I6 attheir free ends adjacent the rod or bar l3. The shaft i4 is additionallyequipped with an arm ll provided at its free 10 end with a roller or camfollower l8 adapted to engage a cam Is on the shaft for the lower pinchroll 5.

Overlying the plate It is an air nozzle 20 receiving air under pressurefrom any suitable source.

In operation the material 3 is advanced by the feed rollers I and 2 pastthe cut-off station, over the rod or bar l3, to and across the plate 16,pinch rolls 4, and 5 and to the advancing rollers 6 and I. It will beappreciated by those familiar with this art that the pinch rolls 4 and 5travel at a lower peripheral speed than the feed rollers. and alsothat'they are timed so that until a predetermined length of material hasbeen advanced,

these two rolls will not pinch the paper. At the proper time, however,these two rolls engage or pinch the advancing strip and inasmuch as theperipheral speed ofthese rolls is lower than that of the feed rollers aslack will be created in the material 3 by the continued forward feedthereof. The air supply to nozzle 20 is on while the machine isoperating, and the cam I9 is so shaped and so timed that as the slack inthe material accumulates the plate I6 moves downwardly. As the air blastis on duringthis period the slack portion of the material will be drivendownwardly to maintain tension in the material from the rod or bar l3back to the feedfollers l and 2, to prevent wrinkling or creasing ofthat portion of the material. The .force of the air blast it will beunderstood is suflicient to maintain tension in I the material duringthe cutting-oi! operation also. W

From the foregoing,

therefore, it will be seen that I have provided an apparatus forhandling What I claim is:

1. In apparatus of the class described, the combination of feed rollersfor continuously advancing a flexible web or strip, pinch rolls in thepath of the advancing strip having a peripheral speed lower than that ofthe feed rollers to produce a slack in the material, and means to applyan air blast to one face of the material during the slackiorming.operation.

2. In apparatus of the class described, the combination of feed rollersfor continuously advancing a flexible web or strip, pinch rolls in thepath of the advancing strip and cooperating with the feed rollers toproduce a slack inthe advancing material, a plate beneath the advancingmaterial for supporting the slack, and means for applying an air blastto the upper face of the material during the slack-forming operation.

3. In apparatus ofthe class described, the combination of feed rollersfor continuously advancing a flexible strip or web, pinch rolls in thepath of the advancing material, the pinch rolls and feed rollerstraveling at diiferent peripheral speeds to produce a slack in the web,a pivotally mounted plate between the feed rollers and pinch rolls forsupporting the material during its passage to the pinch rolls, means forapplying an air blast to the other face of the material during theslack-forming period, and means for pivoting said plate in a directionaway from the web during the slack-forming period.

4. In apparatus of the class described continuously operating webadvancing means, retarding means in the path of the advancing web orstrip for producing a slack in the web or strip, a plate beneath the webfor temporarily supporting the slack and means to apply an air blast tothe upper face of the material immediately above said plate during theslack-forming operation.

5. In apparatus of the class described, the combination of web or stripadvancing means, retarding means in the path of the advancing web orstrip for producing a slack in the advancingmateapplying an air blast tothe upper face of the.

material during the slack forming operation.

7. In apparatus of the class described, the combination of feed rollersfor continuously advancing a flexible web or strip, pinch rolls in thepath of the advancing strip and cooperating with the feed rollers toproduce a slack in the advancin material, a plate beneath the advancingmaterial disposed intermediate the feed rollers and pinch rolls forsupporting the slack, and means for applying an air blast to the upperface of the material immediately above said plate during the slackforming operation.

8. In apparatus of the class described, the combination of feed rollersfor continuously advancing a flexible strip or web, pinch rolls in thepath of the advancing material, the pinch rolls and feed rollerstraveling at different peripheral speeds to produce a slack in the web,a pivotally mounted plate between the feed rollers and pinch rollsdisposed beneath the material for supporting the material during itspassage to the pinch r0115, means for p ying an air blast to the otherface of the material abreast of said plate during the slack formingperiod and means for pivoting said plate in a direction away from theweb during the slack forming period.

ADOLPH POTDEVIN.

